text: // license:BSD-3-Clause
  // copyright-holders:
  /***********************************************************************************************************************************
  
  Skeleton driver for HP-700 series terminals.
  
  ************************************************************************************************************************************/
  
  #include "emu.h"
  #include "cpu/nec/nec.h"
  #include "machine/mc68681.h"
  #include "machine/nvram.h"
  
  class hp700_state : public driver_device
  {
  public:
  	hp700_state(const machine_config &mconfig, device_type type, const char *tag)
  		: driver_device(mconfig, type, tag)
  		, m_maincpu(*this, "maincpu")
  		, m_duart(*this, "duart")
  	{ }
  
  	void hp700_92(machine_config &config);
  	void io_map(address_map &map);
  	void mem_map(address_map &map);
  private:
  	required_device<cpu_device> m_maincpu;
  	required_device<scn2681_device> m_duart;
  };
  
  void hp700_state::mem_map(address_map &map)
  {
  	map(0x00000, 0x1ffff).rom().region("maincpu", 0);
  	map(0x20000, 0x2ffff).ram();
  	map(0x30000, 0x31fff).ram().share("nvram");
  	map(0x34000, 0x34000).nopr();
  	map(0x38000, 0x38fff).lrw8("duart_rw",
  							   [this](address_space &space, offs_t offset, u8 mem_mask) {
  								   return m_duart->read(space, offset >> 8, mem_mask);
  							   },
  							   [this](address_space &space, offs_t offset, u8 data, u8 mem_mask) {
  								   m_duart->write(space, offset >> 8, data, mem_mask);
  							   });
  	map(0xffff0, 0xfffff).rom().region("maincpu", 0x1fff0);
  }
  
  void hp700_state::io_map(address_map &map)
  {
  	map(0x00f2, 0x00f2).nopw();
  }
  
  static INPUT_PORTS_START( hp700_92 )
  INPUT_PORTS_END
  
  MACHINE_CONFIG_START(hp700_state::hp700_92)
  	MCFG_CPU_ADD("maincpu", V20, XTAL(29'491'200) / 3) // divider not verified
  	MCFG_CPU_PROGRAM_MAP(mem_map)
  	MCFG_CPU_IO_MAP(io_map)
  
  	MCFG_NVRAM_ADD_0FILL("nvram")
  
  	MCFG_DEVICE_ADD("duart", SCN2681, XTAL(29'491'200) / 8) // divider not verified
  	MCFG_MC68681_IRQ_CALLBACK(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
  MACHINE_CONFIG_END
  
  
  /**************************************************************************************************************
  
  Hewlett-Packard HP-700/92.
  Chips: TC5564APL-15, proprietary square chip, D70108C-10 (V20), SCN2681, Beeper
  Crystals: 29.4912
  
  ***************************************************************************************************************/
  
  ROM_START( hp700_92 )
  	ROM_REGION(0x20000, "maincpu", 0)
  	ROM_LOAD( "5181-8672.u803", 0x00000, 0x20000, CRC(21440d2f) SHA1(69a3de064ae2b18adc46c2fdd0bf69620375efe7) )
  ROM_END
  
  COMP( 1987, hp700_92, 0, 0, hp700_92, hp700_92, hp700_state, 0, "HP", "HP-700/92", MACHINE_IS_SKELETON )
  